Question

Find the value of x for the function y=-2(x+7) if y has a value of 20

Answer 1

x=-17

Explanation:

-2(x+7)=20

distibute the -2

-2x-14=20

add 14 to both sides

-2x=34

divide by -2

x=-17

Answer 2

x=3

Explanation:

put the value of y=20 in equation

20=2(x+7)

20=2x+14

20-14=2x

6=2x

6/2=x

x=3